Working on a preamp for a bass build, and I figured I would share this little snippet, because it was very difficult (for me) to come up with!

First, for the uninitiated, the 'pulltec trick' refers to a quirk of the vintage "Pulltec EQP-1A" equalizer. Rather than a knob that just goes from 0-10 to boost or cut bass, it has a Frequency switch, and then one knob for bass BOOST, and one for bass CUT. Because the boost and cut aren't exactly matched in frequency and Q, using boost AND cut...

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